A leveling valve for discharging and supplying air from and to a plurality of utilization elements comprises a valve disc arrangement configured to direct air between a source of pressurized air, an exhaust port, and the utilization elements. The valve disc arrangement comprises a first and a second valve disc, which are rotatable with respect to each other such that the valve is switchable between multiple switching positions, and, in some switching positions, either the source of pressurized air or the exhaust port are in fluid communication with the utilization elements. The valve discs provide a stepped increase in flow cross-section in a respective flow path to or from the utilization elements. The stepped increase is dependent on the angle of rotation between the valve discs.

A vehicle suspension system is disclosed. The vehicle suspension system can include a first spring having a first spring characteristic, a second spring having a second spring characteristic, and an actuator coupled to the first and second springs such that actuation of the actuator causes a change in the first and second spring characteristics. The change in the second spring characteristic can be inversely proportional to the change in the first spring characteristic to adjust vehicle handling.

A suspension system including hydraulic circuits that extend between dampers located at opposite corners of the vehicle and at least one load distribution unit that is connected in fluid communication with at least two hydraulic circuits. The load distribution unit includes a manifold block with a cylinder bore, a pair of pressure tubes, a piston rod assembly, and a pair of reserve tubes. The pressure tubes are partially received in the cylinder bore to define a pair of opposed cylinders. The piston rod assembly includes a piston rod and a pair of opposed pistons that are slidingly received within the opposed cylinders. The reserve tubes are at least partially received in the cylinder bore and are arranged annularly about the pressure tubes to define a first pair of reservoir chambers between the pressure tubes and the reserve tubes.

A fluid pressure shock absorber includes a damping valve that is capable of changing damping characteristic in response to a pilot pressure, and a pilot valve configured to supply the working fluid in the bottom-side chamber or the rod-side chamber to a pilot chamber of the damping valve as a pilot pressure. The pilot valve has a first pilot chamber configured such that the working fluid is guided from the bottom-side chamber, and a second pilot chamber configured such that the working fluid is guided from the rod-side chamber. When the fluid pressure shock absorber is not extended/contracted, the pilot valve supplies the pilot pressure to the pilot chamber of the damping valve, and when the fluid pressure shock absorber is extended/contracted, the pilot valve holds the pilot pressure in the pilot chamber of the damping valve supplied when the fluid pressure shock absorber is not extended/contracted.

A plug and play suspension system is disclosed. The plug and play suspension system includes at least one electronically adjustable shock assembly, a controller, and a communications network to communicatively couple said controller with said at least one electronically adjustable shock assembly.

The present disclosure relates to an air supply control arrangement for a heavy-duty vehicle including a lift axle which comprises a brake chamber. The air supply control arrangement includes a control valve and a lever. The control valve has a closed first state in which pressurized air along an air supply passage is blocked by the control valve, and an open second state in which pressurized air is allowed to pass through the control valve along the air supply passage. The lever has a first portion connected to the control valve and a second portion connectable to the lift axle so that when the lift axle is raised from its ride condition to its lift condition the lever moves the control valve from the open second state to the closed first state. When the lift axle is lowered to its ride condition the lever moves the control valve back to the open second state.

A fluid system for a vehicle includes a pump for delivering a fluid, wherein the pump has a first and a second fluid connections, a first actuator and a second actuators to be connected to the first fluid connection via a first and a second actuator valves, respectively, wherein the pump is designed to deliver fluid in a first delivery direction and in a second delivery direction, so that the first actuator and the second actuator are fluidically pressurized by the pump via the first fluid connection when the pump delivers in the first delivery direction, and a control valve for controlling the first and the second actuator valves. The control valve is fluidically separated from the second fluid connection when the pump delivers in the first delivery direction, and the control valve is connected to the second fluid connection when the pump delivers in the second delivery direction.

A fluid pressure shock absorber includes a damping valve that is capable of changing damping characteristic in response to a pilot pressure, and a pilot valve configured to supply the working fluid in the bottom-side chamber or the rod-side chamber to a pilot chamber of the damping valve as a pilot pressure. The pilot valve has a first pilot chamber configured such that the working fluid is guided from the bottom-side chamber, and a second pilot chamber configured such that the working fluid is guided from the rod-side chamber. When the fluid pressure shock absorber is not extended/contracted, the pilot valve supplies the pilot pressure to the pilot chamber of the damping valve, and when the fluid pressure shock absorber is extended/contracted, the pilot valve holds the pilot pressure in the pilot chamber of the damping valve supplied when the fluid pressure shock absorber is not extended/contracted.

A fluid system for a vehicle includes a pump for delivering a fluid, wherein the pump has a first and a second fluid connections, a first and a second actuators to be connected to the first fluid connection via a first and a second actuator valves, respectively, wherein the pump is designed to deliver fluid in a first delivery direction and in a second delivery direction, so that the first actuator and the second actuator are fluidically pressurized by the pump via the first fluid connection when the pump delivers in the first delivery direction, and a control valve for controlling the first and the second actuator valves. The control valve is fluidically separated from the second fluid connection when the pump delivers in the first delivery direction, and the control valve is connected to the second fluid connection when the pump delivers in the second delivery direction.